This page explains how Jonathan Chan (USATT# 1172196)'s rating went from 617 to 614 at the MDTTC September Open held on 4 Sep 2021 - 5 Sep 2021. The links below take you to pages that describe various aspects of the rating processor.

The rating processor goes through 4 passes in order. The links take you to pages that provide detailed explanations of the calculations during each of the 4 passes.